from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, SubmitField
from wtforms.validators import DataRequired, Length, Email, Regexp, EqualTo
from wtforms import ValidationError
from ..models import User

# 登录表单
class LoginForm(FlaskForm): 
    email = StringField('Email', validators=[DataRequired(), Length(1, 64), 
                                             Email()]) 
    password = PasswordField('密码', validators=[DataRequired()]) 
    remember_me = BooleanField('记住我') 
    submit = SubmitField('登录')

# 注册表单
class RegistrationForm(FlaskForm):
    email = StringField('Email', validators=[DataRequired(), Length(1, 64), Email()])
    username = StringField('用户名', validators=[
        DataRequired(), Length(1, 64),
        Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0, '用户名必须在字母开头，后面的字符可以是字母、数字、下划线、点')
    ])
    password = PasswordField('密码', validators=[
        DataRequired(), EqualTo('password2', message='两次密码必须相同')
    ])
    password2 = PasswordField('确认密码', validators=[DataRequired()])
    submit = SubmitField("注册")

    def validate_email(self, field):
        if User.query.filter_by(email=field.data).first():
            raise ValidationError('邮箱已经注册。')

    def validate_username(self, field):
        if User.query.filter_by(username=field.data).first():
            raise ValidationError('用户名已经注册。')